She was travelling alone and had cleared check in and security at London's Heathrow airport but was then told she couldn't get on the plane to Los Angeles and was forced to return to the first class check-in to collect her luggage.

But now the US embassy in London has said she has been invited to apply for a new visa and the matter would be handled "routinely and expeditiously".

A spokeswoman for the US Embassy explained: “There are several ways of legally travelling into the United States and Ms Lawson has been invited to come to the Embassy and apply for a visa for travel to the U.S. We understand she has professional requirements for U.S. travel and these matters are generally handled routinely and expeditiously, so stand by.”